Enhanced mobility of dislocation network nodes and its effect on dislocation multiplication and strain hardening

Bertin, Nicolas; Cai, Wei; Aubry, Sylvie; Arsenlis, Athanasios; Bulatov, Vasily V.

doi:10.1016/j.actamat.2024.119884

Title: Enhanced mobility of dislocation network nodes and its effect on dislocation multiplication and strain hardening

Journal Article · 04 April 2024 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2024.119884 · OSTI ID:2340984

^[1];

^[2];

^[1]; Arsenlis, Athanasios ^[1]; Bulatov, Vasily V. ^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Stanford Univ., CA (United States)

Understanding plastic deformation of crystals in terms of the fundamental physics of dislocations has remained a grand challenge in materials science for decades. To overcome this, the Discrete Dislocation Dynamics (DDD) method has been developed, but its lack of atomistic resolution leaves open the possibility that certain key mechanisms may be overlooked. Here, by comparing large-scale Molecular Dynamics (MD) with DDD simulations performed under identical conditions we uncover significant discrepancies in the predicted strength and microstructure evolution in BCC crystals under high-strain rate conditions. These are traced to unexpected behaviors of dislocation network nodes forming at dislocation intersections, that can move in ways not previously anticipated as revealed by MD. Once these newfound freedoms of nodal motion are incorporated, DDD simulations begin to closely match plastic evolution observed in MD. This additional mechanism of motion whereby non-screw dislocations can change their glide plane profoundly affects fundamental processes of dislocation multiplication, recovery and storage that define strength of metals.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC52-07NA27344; SC0010412

OSTI ID:: 2340984

Report Number(s):: LLNL-JRNL-841695; 1063600

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 271; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
discrete dislocation dynamics
dislocation cross-slip
dislocation mobility
dislocation multiplication
dislocation network nodes
molecular dynamics

Title: Enhanced mobility of dislocation network nodes and its effect on dislocation multiplication and strain hardening

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